In Sean Naylor’s new book Relentless Strike: The Secret History Of Joint Special Operations Command previously unknown details about the stealth Black Hawk helicopters that were used on Bin Laden raid in 2011 are discussed. According to Naylor, the exotic helicopters were test articles from a defunct program that has now been reborn in improved fashion following their use during Operation Neptune Spear.
In the book, Naylor claims the classified project that resulted in only two examples of the exotic Black Hawks being built had two aims. The first was to reshape the aircraft and cover it with radar absorbent material (RAM), to lower its radar signature. The second was to make the aircraft significantly quieter.